20493240 has 32 divisors (see below), whose sum is σ = 61480080. Its totient is φ = 5464832.

The previous prime is 20493197. The next prime is 20493257. The reversal of 20493240 is 4239402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20493240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85269 + ... + 85508.

Almost surely, 2^20493240 is an apocalyptic number.

20493240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20493240 is an abundant number, since it is smaller than the sum of its proper divisors (40986840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20493240 is a wasteful number, since it uses less digits than its factorization.

20493240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170791 (or 170787 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20493240 is about 4526.9459904002. The cubic root of 20493240 is about 273.6550973132.

The spelling of 20493240 in words is "twenty million, four hundred ninety-three thousand, two hundred forty".